Final answer:
Without access to the actual text 'Minnesota in 1870,' it's difficult to definitively determine the document's purpose. It's more likely to inform or provide a historical account (Options B or C), rather than promote tourism. Analysing the document content is essential for a conclusive determination.
Step-by-step explanation:
To determine the purpose of the document 'Minnesota in 1870,' it's important to consider the content and the context in which the document was written. Given that it is a historical document and not a promotional brochure or geographical text, we can narrow down the options. It's unlikely to be promoting tourism since the purpose of historical documents is usually to inform or record rather than to advertise. Therefore, without the actual text we can infer that the purpose may range from describing geography (Option A) to providing a historical account (Option B) or analyzing economic development (Option C).
In a broader educational context, such a document is likely to offer insight into the historical landscape of Minnesota in the 1870s, touching upon various aspects including geography, economy, and historical significance. The precise purpose, however, would be best identified by examining the document content to understand whether it leans more towards providing a factual historical narrative, analyzing economic growth, or describing the geographical features.